System and method for managing short-circuits in a meshed electrical energy distribution network of an aircraft

Patent metadata

Field	Value
Publication number	US-10622806-B2
Application number	US-201715793069-A
Country	US
Kind code	B2
Filing date	Oct 25, 2017
Priority date	Oct 28, 2016
Publication date	Apr 14, 2020
Grant date	Apr 14, 2020

Abstract

A system for managing short-circuits in an aircraft meshed electrical energy distribution network, comprising nodes connected to one another by inter-node links forming a mesh of the network. A system node comprises a switch, a current limiter, circuitry elements to measure the current intensity circulating on the link and circuitry elements to measure a voltage drop on the link, and a control unit configured to acquire a link current measurement, compare the measurement with a predetermined current threshold and, if the measurement exceeds this threshold, command the current limiter to limit the link current, acquire a link voltage drop measurement, determine a time associated with the value of the voltage drop and check whether the voltage drop is still present after a time period equal to the time obtained, and if the voltage drop is still present then, command the opening of the switch corresponding to this link.

First claim

The invention claimed is:

1. A system for managing short-circuits in a meshed electrical energy distribution network of an aircraft, the electrical energy distribution network comprising nodes to which at least one power source and equipment items to be powered is connected by means of external links, the nodes being connected to one another by inter-node links forming at least one mesh of the meshed network, each mesh being polygonal of an order greater than or equal to three, wherein at least one node of the system comprises:
for at least one inter-node link linking the node to another node:
a switch,
a current limiter,
means for measuring an intensity of a current circulating on said inter-node link,
means for measuring a voltage drop on said inter-node link,

a control unit configured to:
acquire a current measurement on said at least one inter-node link, by the intensity measurement means,
compare the current measurement with a predetermined current threshold and, if the current measurement exceeds this predetermined threshold:
command the current limiter to limit the current on the inter-node link,
acquire a measurement of a voltage drop on the inter-node link by the voltage measurement means,
determine a time associated with a value of the voltage drop out of a plurality of times associated with different voltage drop values, each time being different from the other times and being less than each time associated with a voltage drop value less than the voltage drop value with which it is associated,
check whether the voltage drop is still present after a time period equal to the time obtained, and

if the voltage drop is still present after the time period equal to the time obtained, command an opening of the switch corresponding to this inter-node link so as not to allow a passage of an electrical current in this inter-node link on which the voltage drop has occurred.

2. The system according to claim 1 , wherein the control unit is configured to keep the switch closed so as to allow the passage of an electrical current in the inter-node link on which the voltage drop has occurred, if the voltage drop is no longer present after the time period equal to the time obtained.

3. The system according to claim 1 , wherein the node comprises a switch, a current limiter, means for measuring the intensity of a current and means for measuring a voltage drop for each inter-node link linking the node to another node.

4. The system according to claim 1 , wherein each node of the meshed electrical energy distribution network of the aircraft is identical to the other nodes of the meshed electrical energy distribution network of the aircraft.

5. The system according to claim 1 , wherein the current limiter is an electronic device.

6. The system according to claim 5 , wherein the electronic device also provides the switch function for the inter-node link concerned.

7. The system according to claim 1 , wherein the voltage measurement means are conformed to measure a voltage at terminals of the current limiter.

8. An aircraft comprising a system for managing short-circuits in a meshed electrical energy distribution network of the aircraft according to claim 1 .

9. A node of a meshed electrical energy distribution network of an aircraft, the electrical energy distribution network comprising nodes to which at least one power source and equipment items to be powered is connected by means of links, called external links, the nodes being connected to one another by inter-node links forming at least one mesh of the meshed network, each mesh being polygonal of an order greater than or equal to three, said node comprising:
for at least one inter-node link linking the node to another node:
a switch,
a current limiter,
means for measuring an intensity of a current circulating on said inter-node link,
means for measuring a voltage drop on said inter-node link,

a control unit configured to:
acquire a current measurement on said at least one inter-node link, by the intensity measurement means,
compare the current measurement with a predetermined current threshold and, if the current measurement exceeds this predetermined threshold:
command the current limiter to limit the current on the inter-node link,
acquire a measurement of a voltage drop on the inter-node link by the voltage measurement means,
determine a time associated with a value of the voltage drop out of a plurality of times associated with different voltage drop values, each time being different from the other times and being less than each time associated with a voltage drop value less than the voltage drop value with which it is associated,
check whether the voltage drop is still present after a time period equal to the time obtained, and
if the voltage drop is still present after the time period equal to the time obtained, command an opening of the switch corresponding to this inter-node link so as not to allow a passage of an electrical current in this inter-node link on which the voltage drop has occurred.

10. A method for managing short-circuits in a meshed electrical energy distribution network of an aircraft, the electrical energy distribution network comprising nodes to which at least one power source and equipment items to be powered is connected by means of links, called external links, the nodes being connected to one another by inter-node links forming at least one mesh of the meshed network, each mesh being polygonal of an order greater than or equal to three, wherein, at least one node comprises:
for at least one inter-node link linking the node to another node:
a switch,
a current limiter,
means for measuring an intensity of a current circulating on said inter-node link,
means for measuring a voltage drop on said inter-node link,

a control unit,

the method comprises the following steps executed by the control unit:
acquiring a current measurement on said at least one inter-node link, by the intensity measurement means,
comparing the current measurement with a predetermined current threshold and, if the current measurement exceeds this predetermined threshold:
commanding the current limiter to limit the current on the inter-node link,
acquiring a measurement of a voltage drop on the inter-node link by the voltage measurement means,
determining a time associated with a value of the voltage drop out of a plurality of times associated with different voltage drop values, each time being different from the other times and being less than each time associated with a voltage drop value less than the voltage drop value with which it is associated,
checking whether the voltage drop is still present after a time period equal to the time obtained, and
if the voltage drop is still present after the time period equal to the time obtained, commanding an opening of the switch corresponding to this inter-node link so as not to allow a passage of an electrical current in this inter-node link on which the voltage drop has occurred.

Assignees

• Airbus Operations Sas

Inventors

• Donadille Christian
• Chabot Franck
• Fahy Florian

Classifications

• G01R31/086

  in power transmission or distribution networks, i.e. with interconnected conductors · CPC title

• H02H7/28 Primary

  for meshed systems · CPC title

• H02H7/26

  Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured (locating faults in cables G01R31/08) · CPC title

• H02H3/027

  with automatic disconnection after a predetermined time (H02H3/033, H02H3/06 take precedence {; timing in overcurrent protection circuits H02H3/093; in undervoltage protection circuits H02H3/247; staggered disconnection H02H7/30}) · CPC title

• H02H7/222

  for switches · CPC title